* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    font-family: "Microsoft YaHei";
    font-size: 14px;
}
table {
    margin: 50px auto;
    text-align: center;
    background-color: #fff;
    border: 2px solid #00bfa5;
    border-radius: 5px;
    padding: 2px;
}
thead th {
    position: relative;
    width: 140px;
    line-height: 30px;
    background-color: #00af95;
    color: #fff;
}
thead th b{
    height: 0;
    width: 0;
    border: 5px solid transparent;
    position: absolute;
    right: 20px;
    cursor: pointer;
}
thead th b.down {
    border-top-color: rgba(255,255,255,.6);
    top: 15px;
}
thead th b.down:hover {
    border-top-color: rgb(255, 255, 255);
}
thead th b.up {
    border-bottom-color: rgba(255,255,255,.6);
    top: 1px;
}
thead th b.up:hover {
    border-bottom-color: rgb(255, 255, 255);
}
td {
    padding: 5px;
    background-color: rgba(255, 255, 255, .8);
}